LINUX COMMANDS

COPY
- cp index.js node-server/ to the directory
- cp index.js main.js to the current directory
Restart: sudo reboot
Update-Upgrade sudo apt-get update sudo apt-get upgrade
Switch User su - afozbek
User Add useradd afozbek-simple
- adduser afozbek
List Users nano /etc/passwd
Delete User deluser —remove-home newuser
Add Password to User passwd afozbek-simple
Add SSH KEY sudo nano ~/.ssh/authorized_keys
Change SSH Config sudo nano /etc/ssh/sshd_config
Enable Firewall sudo ufw enable
- List sudo ufw app list
  - - Nginx Full: This profile opens both port 80 (normal, unencrypted web traffic) and port 443 (TLS/SSL encrypted traffic)
  - Nginx HTTP: This profile opens only port 80 (normal, unencrypted web traffic)
  - Nginx HTTPS: This profile opens only port 443 (TLS/SSL encrypted traffic)
Look for System is Working Properly
- sudo systemctl status sshd
- sudo systemctl restart ssh
Look Memory Usage
- free -h
- vmstat -s

NGINX (LIKE APACHE) - Reverse Proxy

Stop sudo systemctl stop nginx
Restart service nginx restart
Start sudo systemctl start nginx
- Default HTML location: /var/www/html
/etc/nginx: The Nginx configuration directory. All of the Nginx configuration files reside here.
/etc/nginx/nginx.conf The main Nginx configuration file. This can be modified to make changes to the Nginx global configuration.
- Access Log: /var/log/nginx/access.log
- Error Log: /var/log/nginx/error.log
/etc/nginx/sites-available/: The directory where per-site “server blocks” can be stored. Nginx will not use the configuration files found in this directory unless they are linked to the sites-enabled directory (see below).
/etc/nginx/sites-enabled/: The directory where enabled per-site “server blocks” are stored.
/etc/nginx/snippets: This directory contains configuration fragments that can be included elsewhere in the Nginx configuration.

CTRL + 6 for Mark Set and mark what you want (the end could do some extra help).
ALT + 6 copy selected line
CTRL + K for cutting what you want to copy
CTRL + U for pasting what you have just cut because you just want to copy.
CTRL + U at the place you want to paste.

Add User to Docker Group sudo usermod -aG docker username
Check User is in the Docker Group id -nG
To view system-wide information about Docker, use: docker info
Find and download(if not exist) an image from Docker Hub: docker run {image}
1. Ex: docker run hello-world
Search and list images : docker search {image}
1. Ex: docker search ubuntu
Run a Container and switch to the interactive terminal(-it)
1. docker run -it ubuntu
Listing containers
1. List running containers docker ps
2. List stopped containers docker ps -f “status=exited”
3. List all containers docker ps -a
4. View latest container docker ps -l
Start or Stop a container with its containerId
1. docker start {containerId}
2. docker stop {containerId}
Remove a container with its containerId or name
1. docker rm {containerId}
2. docker rm {name}
Remove an image with its imageId or name
1. docker rmi {imageId}
2. docker rmi {name}
Start a container with giving a custom name with —name
1. docker run --name newName {imageName}
Manage your changes
1. Commit: docker commit -m "added Node.js" -a "{userName}" {containerId} "{userName}"/{newImageName}
2. Push docker push {userName}/{imageName}
Listing the Docker images - (You can see your new image there 😁)
1. docker images
Login to Docker Hub
1. docker login -u {docker-registry-username}